Polyether urethane acrylates

Recently, polyether urethane acrylates and poly(dimethyl-co-methylphenylsiloxane) acrylates have been reported as potential fast-curing, low-modulus coatings for high strength optical fibers... 

In the case of the polyether urethane acrylates, the material properties were varied by the length of the poly(propylene oxide) chain. Increasing the chain length decreases crosslink density and content of polar urethane groups and increases the volume fraction of low T, low refractive index polyether. As a result T, refractive index and E-modulus decrease. The addition of a small amount of reactive diluent (g20%) brings the viscosity and the curing rate to the desired level. 

Polyester acrylates are normally formed by the reaction of polyester or polyether polyols reacted with acrylic acid. As with urethane acrylates, this gives the chemical structure of polyester acrylates great... 

ACRYLATED EPOXY ACRYLATED URETHANE ACRYLATED POLYETHER ACRYLATED POLYESTERS... 

The essential ingredients of a free-radical adhesive formulation are an acrylate-terminated prepolymer and a photoinitiator. A wide range of prepolymers can be acrylated, including epoxies, urethanes, polyesters, polyethers, and rubbers. Those most commonly used in adhesive formulations are epoxy and urethane acrylates. Epoxy acrylates have properties similar to those of the parent epoxy resin, with excellent adhesion, chemical resistance, and toughness. Urethane acrylates, on the other hand, are noted for their high reactivity, good adhesion, flexibility, and tear resistance. 

Chem. Descrip. Aliphatic polyether-based urethane acrylate oligomer blended with hexanediol diacrylate... 

The oligomeric polyol may be a low MW flexible polyester or a polyether (pp. 228-9). Urethane acrylates can possess a range of properties dependent on the contributions of the softer polyol centre block and the outer urethane hard segments. 

Figure 7. Adhesion of 5. epidermidis KH 11 onto polyether-urethane modified in a glow discharge treatment with different gases and acrylic acid (smaller columns adhesion after precoating of the polymer surfaces with a synthetic protein solution) where water = water contact angle of the modified poly-etherurethanes-...

Liquid organic rubbers with reactive functionality can be prepared by several methods. End-functional oligomers are preferred. Chains attached to the network at only one end do not contribute as much strength to the network as those attached at both ends [34], Urethane chemistry is a handy route to such molecules. A hydroxy-terminated oligomer (commonly a polyester or a polyether) can be reacted with excess diisocyanate, and then with a hydroxy methacrylate to form a reactive toughener [35]. The methacrylate ends undergo copolymerization with the rest of the acrylic monomers. The resulting adhesive is especially effective on poIy(vinyl chloride) shown in Scheme 2. 

Polyols and polyamines are the most important coreactants for isocyanates. As briefly outlined in Section 4.2.2, the two most common classes of urethane-grade polyols are the polyethers and polyesters. In this section their synthesis and structure are discussed. Other polyol types, such as acrylic resins and polycarbonates, are of more limited applicability and are not presented here. 

Because the components must initially form miscible solutions or swollen networks a degree of affinity between the reacting components is needed. Therefore, most of the investigations into epoxy IPNs have involved the use of partially miscible components such as thermoplastic urethanes (TPU) with polystyrenes [57], acrylates [58-61] or esters which form loose hydrogen-bound mixtures during fabrication [62-71 ]. Epoxy has also been modified with polyetherketones [72],polyether sulfones [5] and even polyetherimides [66] to help improve fracture behavior. These systems, due to immiscibility, tend to be polymer blends with distinct macromolecular phase morphologies and not molecularly mixed compounds. 

Carbon-13 spin-lattice relaxation times are measured for poly(octadecyl acrylate) above and below the melting point of the crystalline side chains. The behaviours of lithium ions in a polyether poly(urethane urea) (PEUU) were investigated by C MAS solid-state NMR. ... 

This technique has found the following applications in addition to those discussed in Sections 10.1 (resin cure studies on phenol urethane compositions) [65], 12.2 (photopolymer studies [66-68]), and 13.3 (phase transitions in PE) [66], Chapter 15 (viscoelastic and rheological properties), and Section 16.4 (heat deflection temperatures) epoxy resin-amine system [67], cured acrylate-terminated unsaturated copolymers [68], PE and PP foam [69], ethylene-propylene-diene terpolymers [70], natural rubbers [71, 72], polyester-based clear coat resins [73], polyvinyl esters and unsaturated polyester resins [74], polyimide-clay nanocomposites [75], polyether sulfone-styrene-acrylonitrile, PS-polymethyl methacrylate (PMMA) blends and PS-polytetrafluoroethylene PMMA copolymers [76], cyanate ester resin-carbon fibre composites [77], polycyanate epoxy resins [78], and styrenic copolymers [79]. 

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